HEROTHERE

Can you do a how to on installing RTS? i did it but items spawn above my head and i cant use or move them. :(

Hello I am kind of new to mods and i downloaded RTS or real time settler and i fully downloaded it and i found bess and everything i made a settlement and went to her inventory got all the items from aid and i go to place an item and it wont work, iv seen videos and it says please wait at the top left part of the screen and the item spawns but for me they spawn up in the air above me. I have tried multiple things and nothing will work, Please help if anyone knows what the problem is. -thank you. :)